How much too feed and how to feed

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I've got a young leopard gecko (probably around 10 weeks old). Tonight he ate 15 meal worms and two crickets quite happily (the meal worms are quite small though). He's only just started eating the crickets and I think its because I took their back legs off (he's always ignored them before). How much should he be eating and what's an easy way to take the legs off crickets? (It took me ages and if I'm going to feed more crickets I need an easier way!